Information And Treatment
The corners of your mouth (the area around the corner of the lips is technically called the oral commissure) can droop as you age. In younger people, this is often because of overactive pulling action of the depressor anguli oris muscle, which controls frowning.
In older people, the drooping of the oral commissure is typically due to loss of fat and skin elasticity around the mouth. When the corners of the mouth droop, it can create a sadder, older expression.
Age range: If an overactive depressor muscle is the culprit, the corners of the mouth can begin to droop as early as the age of 30. Fat loss and lax skin will cause the mouth to droop after the age of 40.